/Engine/Source/Runtime/Core/Public/Misc/PreloadableFile.h
Remove theFPreloadableFileinstance if it is registered for its FileName. Returns whether the instance was registered.
static bool UnRegister ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FPreloadableFile](API\Runtime\Core\Misc\FPreloadableFile) > & PreloadableFile )